Meaning

noun the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life

originEtymology tree Proto-Indo-European *h₂eHs- Proto-Indo-European *-tḗr Proto-Indo-European *h₂stḗr Proto-Hellenic *astḗr Ancient Greek ἀστήρ (astḗr) Ancient Greek ᾰ̓́στρον (ắstron)der. English astro- Proto-Indo-European *gʷeyh₃-der. Ancient Greek βίος (bíos) Proto-Indo-European *leǵ- Ancient Greek λόγος (lógos) Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-i-eh₂…

Etymology from Wiktionary, CC BY-SA 3.0